Joke #6755

A mathematician and his best friend, an engineer, attend a public lecture on geometry in thirteen-dimensional space.
"How did you like it?" the mathematician wants to know after the talk.
"My head's spinning," the engineer confesses.
"How can you develop any intuition for thirteen-dimensional space?"
"Well, it's not even difficult.
All I do is visualize the situation in n-dimensional space and then set n = 13."